<?php

/*
 * This file is part of SwiftMailer. (c) 2004-2009 Chris Corbyn For the full copyright and license information, please view the LICENSE file that was distributed with this source code.
 */

/**
 * Processes bytes as they pass through a stream and performs filtering.
 * 
 * @package Swift
 * @author Chris Corbyn
 */
interface Swift_StreamFilter {
	/**
	 * Based on the buffer given, this returns true if more buffering is needed.
	 * 
	 * @param mixed $buffer        	
	 * @return boolean
	 */
	public function shouldBuffer($buffer);
	
	/**
	 * Filters $buffer and returns the changes.
	 * 
	 * @param mixed $buffer        	
	 * @return mixed
	 */
	public function filter($buffer);
}
